1+tan^2a/1+cot^2a= 1+tan^2a
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your question are wrong brother
right question 1+tan^2a/1+cot^2a=tan^2a
from LHS
= 1+tan^2a/1+cot^2a
= sec^2a/cosec^2a
= 1/cos^2a/1/sin^2a
= sin^2a/cos^2a
= tan^2a
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